SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9393bd699475e26d3b97578797fb7d95efe1b2531e142fe5a1b838dc48315863' 
  AND token = 'AiOu9tuzxN/YSRL2jzlqHzkHDQq/mZUcyIsyNjlhlgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}